Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 18: Nanoelectronics I - Quantum Dots, Wires, Point Contacts
TT 18.11: Vortrag
Mittwoch, 28. März 2007, 16:45–17:00, H19
Commensurate-incommensurate transition in 1D Coulomb drag — •Markus Garst1, Leonid Glazman2, and Ady Stern3 — 1Institut für Theoretische Physik, Universität zu Köln, 50937 Köln — 2Theoretical Physics Institute, University of Minnesota, Minneapolis, MN 55455, USA — 3Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel
Coulomb interaction between electrons of two parallel conducting wires results in a drag effect which is able to reveal various strong interaction effects. When the electron densities in the two wires are commensurate the system is unstable with respect to the formation of an interwire charge density wave (CDW). If the difference of electron densities exceeds a critical value the system undergoes a commensurate-incommensurate quantum phase transition, which can be tuned for example by an external gate voltage. We identify the critical theory governing this transition. We calculate the critical Coulomb drag effect and find that the drag resistance is given by an universal function of temperature and commensurability.